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[CCMC 13102-R] CCMC Canadian code compliance evaluation

From: National Research Council Canada

In most jurisdictions this document is sufficient evidence for approval by Canadian authorities.

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Code compliance opinion

It is the opinion of the Canadian Construction Materials Centre that the evaluated product, when used as an augered steel pile in a foundation system in accordance with the conditions and limitations stated in this evaluation, complies with the following code:

National Building Code of Canada 2015

ID Code provision Solution type
04-02-03-08-01-e-004.2.3.8.(1)(e) CSA G40.21, "Structural Quality Steel."Acceptable
04-02-03-10-00-0-004.2.3.10.(1) Where conditions are corrosive to steel, ...Acceptable
04-02-04-01-00-0-004.2.4.1.(1) The design of foundations, excavations a ...Acceptable
04-03-04-01-00-0-004.3.4.1.(1) Buildings and their structural members m ...Acceptable
09-04-01-01-01-c-019.4.1.1.(1)(c)(i) Part 9, orAcceptable

Ontario Building Code

Ruling No. 04-16-120 (13102-R) authorizing the use of this product in Ontario, subject to the terms and conditions contained in the Ruling, was made by the Minister of Municipal Affairs and Housing on 2004-07-20 (revised 2012-07-27) pursuant to s.29 of the Building Code Act, 1992 (see Ruling for terms and conditions). This Ruling is subject to periodic revisions and updates.


The above opinion is based on the evaluation by the CCMC of technical evidence provided by the evaluation holder, and is bound by the stated conditions and limitations. For the benefit of the user, a summary of the technical information that forms the basis of this evaluation has been included.

Product information

Product name

Postech Screw Piles

Product description

The product is an earth anchor constructed of helical-shaped circular steel blade(s) that is (are) welded to a steel shaft. The blade is constructed as a helix with a carefully controlled pitch.

The anchors come in seven pile types: P178, P238, P312, P400, P412, P512, and P658. The Properties of the product pile type table indicates the properties for each pile type.

Table 1.  Properties of the product pile type
Type Exterior diameter of post Wall thickness of post Diameter of helix blade Thickness of blade
Pile P178 48 mm 3.7 mm 200 mm 8 mm
255 mm
300 mm
Pile P238 60 mm 3.9 mm 200 mm 8 mm
255 mm
300 mm
355 mm 9.5 mm
300 mm 12.7 mm
355 mm
455 mm
Pile P312 89 mm 5.5 mm 255 mm 9.5 mm
300 mm
355 mm
405 mm 12.7 mm
455 mm
Pile P400 101 mm 5.7 mm 255 mm 9.5 mm
300 mm
355 mm
405 mm 12.7 mm
455 mm
505 mm
Pile P412 114 mm 6.0 mm 300 mm 9.5 mm
355 mm
405 mm 12.7 mm
455 mm
505 mm
555 mm
Pile P512 140 mm 6.5 mm 355 mm 12.7 mm
405 mm
455 mm
505 mm
555 mm
610 mm
Pile P658 168 mm 7.1 mm 355 mm 12.7 mm
405 mm
455 mm
505 mm
555 mm
610 mm
660 mm

 

The anchor type and blade diameter are chosen based on the bearing capacity of the soil and the load the auger-installed steel pile is designed to support. The central shaft is used to transmit torque during installation and to transfer axial loads to the helical plate.

The foundation system comes with various other accessories, such as plates, to adapt to the building structure, extension shafts and connectors, which conform to CSA G40.20-13/G40.21-13, “General Requirements for Rolled or Welded Structural Quality Steel/Structural Quality Steel” All accessories with treaded rods conform to ASTM A 325-14.

The steel shaft, blades and accessories conform to the 350 MPa requirement of CSA G40.20/G40.21 or ASTM A 500/A 500M-10a, “Standard Specification for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes.” They have a galvanic coating that meets the 610 g/m2 requirement of ASTM A 123/A 123M, “Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products.” All welders at Pieux Vistech / Postech Screw Pile Inc. are certified in accordance with the Canadian Welding Bureau to produce welds conforming to CSA W59-13, “Welded Steel Construction (Metal Arc Welding)”.

Figure 1 shows a typical steel pile with a single helical blade.

Illustration of Postech Screw Piles.
Figure 1. Pieux Vissés Vistech / Postech Screw Piles
  1. shaft
  2. helical blade

Manufacturing plant

This evaluation is valid only for products produced at the following plant:

Product nameSherbrooke, Québec, Canada
Postech Screw Piles⦿

⦿ Indicates that the product from this manufacturing facility has been evaluated by the CCMC

  Conditions and limitations

The CCMC’s compliance opinion is bound by this product being used in accordance with the conditions and limitations set out below.

  • The product under this evaluation is intended to be used as a foundation system to support the following types of construction:
    • Single storey residential buildings within the scope of Part 9 of NBC 2015; and
    • Accessory buildings such as sheds, gazebos, sunrooms, carports, decks or porches within the scope of Part 9 of NBC 2015.

    Other applications are beyond the scope of this evaluation, and a professional engineer skilled in such design and licensed to practice under the appropriate provincial or territorial legislation must determine the pile capacity and other design parameters.

  • The product may be used as part of a foundation system to support various constructions, provided that it is installed according to the manufacturer’s current instructions and within the scope of this evaluation.
  • When the product is installed in granular soil or silt, there is a direct relationship between the applied torque and the allowable compressive and tensile loads. The Allowable compressive and tensile loads for the product in granular soil or silt table indicates the allowable compressive and tensile loads as a function of the applied torque.
  • When the product is installed in a cohesive soil, such as clay, there is a direct relationship between the applied torque and the allowable compressive and tensile loads. The Allowable compressive and tensile loads for the product in cohesive soil table indicates the allowable compressive and tensile loads as a function of the applied torque.
  • When the auger-installed steel pile is installed in a soil with granular material that exceeds 200 mm in diameter, the relationship between the applied torque and the allowable compressive and tensile loads is not as predictable. When it is installed in such soils, the allowable compressive and tensile loads have to be confirmed by on-site load tests. These load tests are also required if the allowable loads need to be greater than those stated in the above-referenced tables. The tests need to be conducted under the direct supervision of a professional geotechnical engineer, skilled in such design and licensed to practice under the appropriate provincial or territorial legislation.
  • In all cases, a registered professional engineer skilled in such design and licensed to practice under the appropriate provincial or territorial legislation must determine the number and spacing of the auger-installed steel piles required to carry all the factored loads. A certificate attesting to the conformity of the installation and the allowable loads for the piles must be provided by a certified installer.
  • Where conditions (soil and environmental) are determined to be corrosive to steel, protection of the steel shall be provided. The determination of the presence of corrosive conditions and the specification of the corrosion protection shall be carried out by a registered professional engineer licensed to practice under the appropriate provincial or territorial legislation. If the determination of the presence of corrosive conditions is not completed before installation, the product, including all its accessories, is required to be hot-dipped galvanized, meeting the requirements of CAN/CSA-G164 (ASTM A 123/A 123M-17) with a minimum thickness of 610 g/m2, or another method that provides an equivalent level of protection and abrasion resistance deemed acceptable by the CCMC.
  • The installation of the auger-installed steel pile must be carried out as per the manufacturer’s instructions. The Pieux Vissés Vistech / Postech Screw Piles must be screwed into the ground to below the frost line using mechanized equipment. The anchor is rotated into the ground with sufficient applied downward pressure (crowd) to advance the anchor one pitch distance per revolution. The anchor is advanced until the applied torque value attains a specified value. Extensions are added to the central shaft as needed. The applied loads may be tensile (uplift) or compressive (bearing). Helical anchors are rapidly installed in a wide variety of soil formations using a variety of readily available equipment. They are immediately ready for loading after installation.
  • The installer of the proposed auger-installed steel piles must be certified by Pieux Vistech – Postech Screw Piles Inc. Using approved equipment, the installer must follow the manufacturer’s installation instructions and the uses and limitations specified in this evaluation. Each installer must carry a certification card bearing their signature and photograph.
  • Each Pieux Vissés Vistech / Postech Screw Pile must be identified with a label containing the following information: 
    • manufacturer’s identification; and 
    • the phrase “CCMC 13102-R.”

  Technical information

This evaluation is based on demonstrated conformance with the following criteria:

Evaluation requirements
Criteria number Criteria name
CCMC-TG-316216.01-15BCCMC Technical Guide for Augered-Installed Steel Piles

The proposed auger-installed steel piles were tested to:

  • ASTM D 1143/D 1143M-07(2013), “Standard Test Methods for Deep Foundations Under Static Axial Compressive Load,”
  • ASTM D 3689/D 3689M-07(2013)e1, “Standard Test Methods for Deep Foundations Under Static Axial Tensile Load,” and
  • ASTM D 3966/D 3966M-07(2013)e1, “Standard Test Methods for Deep Foundations Under Lateral Load.”

Testing was conducted on four different sites across Canada. Two sites had granular and clay soil; the other two had cohesive soil. A series of 32 tests was performed. The intent of the testing was to determine a correlation between the torque applied during installation and the allowable loads. In the granular and silt-based soils and in the cohesive soils, there was a good correlation between the torque applied during installation and the allowable loads. In the granular and silt-based soils, for the compressive loads noted in the Allowable compressive and tensile loads for the product in granular soil or silt, the factor of safety varied from 1.7 to 3.0. For the tensile loads, the factor of safety varied from 2.0 to 2.4. For the lateral loads, no correlation was possible.

Table 2.  Allowable compressive and tensile loads for the product in granular soil or siltTable footnote (1)
Applied torque Allowable loads
Compression Tension
N·m (lbf·ft) kN (lb) kN (lb)
678 500 20 4 500 4 900
1 017 750 24 5 400 8 1 800
1 356 1 000 29 6 525 11 2 475
1 695 1 250 34 7 650 14 3 150
2 034 1 500 39 8 775 18 4 050
2 373 1 750 44 9 900 21 4 725
2 712 2 000 49 11 025 25 5 625
3 051 2 250 53 11 925 31 6 975
3 390 2 500 58 13 050 31 6 975
3 728 2 750 63 14 175 35 7 875
4 068 3 000 68 15 300 40 9 000
4 407 3 250 73 16 425 44  9 900
4 746 3 500 78 17 550 48 10 800
5 085 3 750 82 18 450 50 11 250
5 424 4 000 87 19 575 52 11 700
5 763 4 250 92 20 700 54 12 150
6 102 4 500 97 21 825 56 12 600
6 441 4 750 - - 58 13 050
6 780 5 000 - - 60 13 500

 

Table 3.  Allowable compressive and tensile loads for the product in cohesive soilTable footnote (1)
Applied torque Allowable loads
Compression Tension
N·m (lbf·ft) kN (lb) kN (lb)
1 017 750 8 1 800 6 1 350
1 356 1 000 11 2 475 8 1 800
1 695 1 250 14 3 150 10 2 250
2 034 1 500 17 3 825 12 2 700
2 373 1 750 19 4 275 14 3 150
2 712 2 000 22 4 950 16 3 600
3 051 2 250 25 5 625 19 4 275
3 390 2 500 28 6 300 21 4 725
3 728 2 750 31 6 975 23 5 175
4 068 3 000 33 7 425 25 5 625
4 407 3 250 36 8 100 27 6 075
4 746 3 500 39 8 775 29 6 525
5 085 3 750 42 9 450 32 7 200
5 424 4 000 44 9 900 34 7 650
5 763 4 250 47 10 575 36 8 100
6 102 4 500 50 11 250 38 8 550

Administrative information

Disclaimer

This evaluation is issued by the Canadian Construction Materials Centre (CCMC), a part of the Construction Research Centre at the National Research Council of Canada (NRC). The evaluation must be read in the context of the entire CCMC Registry of Product Assessments and the legislated applicable building code in effect.

The CCMC was established in 1988 on behalf of the applicable regulator (i.e., the provinces and territories) to ensure—through assessment—conformity of alternative and acceptable solutions to regional building codes as determined by the local authority having jurisdiction (AHJ) as part of the issuance of a building permit.

It is the responsibility of the local AHJs, design professionals, and specifiers to confirm that the evaluation is current and has not been withdrawn or superseded by a later issue. Please refer to the website or contact:

Canadian Construction Materials Centre
Construction Research Centre
National Research Council of Canada
1200 Montreal Road
Ottawa, Ontario, K1A 0R6
Telephone: 613-993-6189
Fax: 613-952-0268

The NRC has evaluated the material, product, system or service described herein only for those characteristics stated herein. The information and opinions in this evaluation are directed to those who have the appropriate degree of experience to use and apply its contents (i.e., AHJs, design professionals and specifiers). This evaluation is only valid when the product is installed in strict compliance with the stated conditions and limitations of evaluation and the applicable local building code. In circumstances where no applicable local building permit is issued and that no confirmation of compliance ‘for use in the intended field application’ is undertaken, this evaluation is null and void in all respects. This evaluation is provided without representation, warranty, or guarantee of any kind, expressed, or implied, and the NRC provides no endorsement for any evaluated material, product, system or service described herein. The NRC accepts no responsibility whatsoever arising in any way from any and all use and reliance on the information contained in this evaluation with respect to its compliance to the referenced code(s) and standard(s). The NRC is not undertaking to render professional or other services on behalf of any person or entity nor to perform any duty owed by any person or entity to another person or entity.

Language

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In the case of any discrepancy between the English and French version of this document, the English version shall prevail.

Copyright

© 2022 Her Majesty the Queen in Right of Canada, as represented by the National Research Council of Canada.

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written permission of the CCMC.

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